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Stress Analysis Report RTLS BLACK BOOM ARM

Analyzed File:	BOOM ARM.ipt
Autodesk Inventor Version:	2025 (Build 290162010, 162A)
Creation Date:	5/22/2025, 7:22 PM
Study Author:	Peter Cross
Summary:	General Report of expected deformation of HIPS plastic boom arm assembly given 1.6x forces applied to a single arm

Static Analysis:1

General objective and settings:

Design Objective Single Point

Study Type Static Analysis

Last Modification Date 5/22/2025, 7:20 PM

Model State [Primary]

Detect and Eliminate Rigid Body Modes No

iProperties

Summary

Title
Company

Project

Part Number BOOM ARM

Physical

Material Polystyrene, High Impact
Density 1.022 g/cm^3
Mass 0.045853 kg
Area 14947.8 mm^2
Volume 44866 mm^3
Center of Gravity x=12.8012 mm
y=5.81411 mm
z=6 mm

Note: Physical values could be different from Physical values used by FEA reported below.

Mesh settings:

Avg. Element Size (fraction of model diameter) 0.1

Min. Element Size (fraction of avg. size) 0.2

Grading Factor 1.5

Max. Turn Angle 60 deg

Create Curved Mesh Elements Yes

Material(s)

Name Polystyrene, High Impact

General Mass Density 1.022 g/cm^3

Yield Strength 26.5 MPa

Ultimate Tensile Strength 26.5 MPa

Stress Young's Modulus 1.9 GPa

Poisson's Ratio 0.38 ul

Shear Modulus 0.688406 GPa

Part Name(s) BOOM ARM.ipt

Operating conditions

Gravity

Load Type Gravity

Magnitude 9810.000 mm/s^2
Vector X 123.503 mm/s^2
Vector Y -9809.223 mm/s^2
Vector Z 0.000 mm/s^2

Selected Face(s)

Force:1

Load Type Force

Magnitude 19.613 N
Vector X 0.000 N
Vector Y 19.613 N
Vector Z 0.000 N

Selected Face(s)

Moment:1

Load Type Moment

Magnitude 200.000 N mm
Vector X 0.000 N mm
Vector Y -200.000 N mm
Vector Z 0.000 N mm

Selected Face(s)

Pin Constraint:1

Constraint Type Pin Constraint

Fix Radial Direction Yes
Fix Axial Direction Yes
Fix Tangential Direction No

Selected Face(s)

Fixed Constraint:1

Constraint Type Fixed Constraint

Selected Face(s)

Fixed Constraint:2

Constraint Type Fixed Constraint

Selected Face(s)

Results

Reaction Force and Moment on Constraints

Constraint Name Reaction Force Reaction Moment

Magnitude Component (X,Y,Z) Magnitude Component (X,Y,Z)

Pin Constraint:1 199.633 N -182.925 N 0.0352933 N m -0.0138144 N m

79.9005 N 0.0324773 N m

2.72697 N 0 N m

Fixed Constraint:1 138.138 N 62.2489 N 0.246082 N m 0.00209686 N m

-123.317 N 0.0106499 N m

0 N -0.245842 N m

Fixed Constraint:2 122.96 N 120.551 N 0.0670574 N m 0.0281119 N m

24.1079 N 0.0587578 N m

-2.35639 N -0.0159354 N m

Result Summary

Name Minimum Maximum

Volume 44865.9 mm^3

Mass 0.045853 kg

Von Mises Stress 0.01179 MPa 9.03583 MPa

1st Principal Stress -2.04716 MPa 7.29908 MPa

3rd Principal Stress -10.7805 MPa 2.39555 MPa

Displacement 0 mm 8.93737 mm

Safety Factor 2.93277 ul 15 ul

Figures

Von Mises Stress

1st Principal Stress

3rd Principal Stress

Displacement

Safety Factor

F:\Desktop\Projects\RTLS_VIC\CAD\BOOM ARM.ipt

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Design Objective	Single Point
Study Type	Static Analysis
Last Modification Date	5/22/2025, 7:20 PM
Model State	[Primary]
Detect and Eliminate Rigid Body Modes	No

Material	Polystyrene, High Impact
Density	1.022 g/cm^3
Mass	0.045853 kg
Area	14947.8 mm^2
Volume	44866 mm^3
Center of Gravity	x=12.8012 mm y=5.81411 mm z=6 mm

Avg. Element Size (fraction of model diameter)	0.1
Min. Element Size (fraction of avg. size)	0.2
Grading Factor	1.5
Max. Turn Angle	60 deg
Create Curved Mesh Elements	Yes

Name	Polystyrene, High Impact
General	Mass Density	1.022 g/cm^3
	Yield Strength	26.5 MPa
	Ultimate Tensile Strength	26.5 MPa
Stress	Young's Modulus	1.9 GPa
	Poisson's Ratio	0.38 ul
	Shear Modulus	0.688406 GPa
Part Name(s)	BOOM ARM.ipt

Load Type	Gravity
Magnitude	9810.000 mm/s^2
Vector X	123.503 mm/s^2
Vector Y	-9809.223 mm/s^2
Vector Z	0.000 mm/s^2

Load Type	Force
Magnitude	19.613 N
Vector X	0.000 N
Vector Y	19.613 N
Vector Z	0.000 N

Load Type	Moment
Magnitude	200.000 N mm
Vector X	0.000 N mm
Vector Y	-200.000 N mm
Vector Z	0.000 N mm

Constraint Type	Pin Constraint
Fix Radial Direction	Yes
Fix Axial Direction	Yes
Fix Tangential Direction	No

Constraint Name	Reaction Force		Reaction Moment
	Magnitude	Component (X,Y,Z)	Magnitude	Component (X,Y,Z)
Pin Constraint:1	199.633 N	-182.925 N	0.0352933 N m	-0.0138144 N m
		79.9005 N		0.0324773 N m
		2.72697 N		0 N m
Fixed Constraint:1	138.138 N	62.2489 N	0.246082 N m	0.00209686 N m
		-123.317 N		0.0106499 N m
		0 N		-0.245842 N m
Fixed Constraint:2	122.96 N	120.551 N	0.0670574 N m	0.0281119 N m
		24.1079 N		0.0587578 N m
		-2.35639 N		-0.0159354 N m

Name	Minimum	Maximum
Volume	44865.9 mm^3
Mass	0.045853 kg
Von Mises Stress	0.01179 MPa	9.03583 MPa
1st Principal Stress	-2.04716 MPa	7.29908 MPa
3rd Principal Stress	-10.7805 MPa	2.39555 MPa
Displacement	0 mm	8.93737 mm
Safety Factor	2.93277 ul	15 ul